Product Overview
Upgrade the braking performance of your BMW M2, M3 or M4 F8X with the XC3 BTCC Big Brake Kit featuring AP Racing CP9668 Pro 5000 R six-piston endurance calipers. Built around ex-BTCC 368mm x 36mm floating rotors, 25mm brake pads and XC3 precision-engineered mounting components, this complete front brake upgrade is designed for fast road, track day and endurance use.
The CP9668 caliper uses a deeper 25mm pad compared with the 18mm pad used in the CP9660, giving increased pad volume, longer consumable life and improved suitability for repeated high-temperature braking.
Key Features
- AP Racing CP9668 Pro 5000 R six-piston endurance calipers
- Choice of Anodised Grey or Nickel Plated caliper finish
- Full-depth 25mm brake pad format
- Ex-BTCC 368mm x 36mm floating brake rotors
- XC3 6082-T6 billet aluminium rotor bells
- XC3 6082-T6 billet aluminium caliper brackets
- AP Racing floating bobbin hardware
- Optional anti-rattle clips available
- Braided front brake lines
- Chemi black high-tensile bracket hardware
- PAGID Racing RSL29 25mm brake pads included
- Designed for BMW M2, M3 and M4 F8X with OEM front hubs
- XC3 manufactured components covered by our Lifetime Warranty
Product Description
The BMW M2, M3 and M4 F8X platform is highly capable, but repeated hard braking on road or track can quickly expose the limits of the factory braking system. Higher speeds, high-grip tyres, increased power and longer sessions create more heat, more pad demand and less braking consistency.
The XC3 BTCC Big Brake Kit solves this with a motorsport-derived braking package built around 368mm x 36mm floating BTCC rotors and AP Racing CP9668 endurance calipers. The larger rotor size increases thermal capacity, while the floating bobbin assembly allows controlled rotor expansion under temperature. The CP9668’s 25mm pad format gives more friction material volume than the CP9660, making it better suited to longer sessions, heavier use and endurance-focused driving.
Customers can choose between Anodised Grey calipers for a motorsport-style finish or Nickel Plated calipers for a premium, corrosion-resistant appearance. Optional anti-rattle clips are also available for customers who want to reduce floating rotor hardware noise while retaining the benefits of a floating disc assembly.
XC3-designed bells and caliper brackets ensure correct rotor positioning, caliper alignment and pad sweep on the F8X chassis. The supplied rotors are inspected ex-BTCC components, allowing customers to access high-level motorsport hardware at a more cost-effective price point than a fully new equivalent setup. Some cosmetic marks and signs of previous motorsport use should be expected.
Why Buy from XC3
XC3 Engineering designs and manufactures key brake kit components in the UK, including our vehicle-specific rotor bells and caliper brackets. Every XC3-manufactured component is developed for accurate fitment, correct brake geometry and real-world track use.
Our manufactured components are covered by the XC3 Lifetime Warranty, giving you confidence that your brake kit is supported by proper engineering, not just supplied as a collection of parts.
All XC3 Big Brake Kit customers also receive 10% off future replacement brake consumables, including pads, rotors, bells and service hardware, helping reduce long-term running costs.
What’s Included
- 2 x AP Racing CP9668 six-piston endurance calipers
- Choice of Anodised Grey or Nickel Plated caliper finish
- 2 x ex-BTCC 368mm x 36mm floating brake rotors
- 2 x XC3 6082-T6 billet aluminium rotor bells
- 2 x XC3 6082-T6 billet aluminium caliper brackets
- 2 x AP Racing floating bobbin kits
- Optional anti-rattle clips
- 1 x pair braided front brake lines
- Chemi black high-tensile mounting hardware
- 1 x set PAGID Racing RSL29 25mm brake pads
Vehicle Fitment
- BMW M2 F87
- BMW M2 Competition F87
- BMW M3 F80 inc Comp
- BMW M4 F82 inc Comp
- BMW M4 F83 inc Comp
For vehicles using OEM front hubs. Professional installation required. Wheel clearance must be checked before ordering, especially with aftermarket wheels. These kits may be made to order depending on stock availability.
